Aim: To compare the effects of fentanyl 25microgram and clonidine 30 microgram as additives to 3 ml of 0.5 % hyperbaric bupivacaine for spinal anaesthesia in lower extremity orthopedic and urological surgeries. Materials and methods: This prospective, randomized, double blind study was conducted on 60 adult patients of ASA physical status 1 & 2 in the age group of 20 years to 60 years, posted for elective lower limb and urological surgeries under spinal anaesthesia. Patients belonging to group BF received 3 ml (15 mg) of hyperbaric bupivacaine (0.5 %) + 0.5 ml (25 microgram) fentanyl. Patients of group B received 3 ml (15 mg) of hyperbaric bupivacaine (0.5 + 0.2 ml (30 microgram) clonidine + 0.3 ml of normal saline. The following parameters were observed - onset and duration of sensory block, onset and duration of motor block, durations of complete and effective analgesia and any side effects associated with these drugs